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In order to destroy dissolved chlorine in water, you have to add a reducing agent like some metal, like thin iron wires. The trouble is that with iron, the reaction is rather slow and chlorine will produce a rust deposit, which is disagreeable in a pool. Or you may burn some sulfur in a big bottle containing a little water, just enough to cover the bottom. ...


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Yes, add dilute 3% H2O2 (at least, those stabilized H2O2s that are safe to ingest). A fast reaction ([EDIT] especially as compared to a Vitamin C path): $\ce{ NaOCl + H2O2 -> NaCl + H2O + O2 (g)}$ As the solution is dilute, there is little chance of any Singlet Oxygen (which emits a transient visible red glow in absence of light). The positives are ...


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